The Role of Anticyclonic Eddies in the Arctic Halocline

反气旋涡流在北极盐跃层中的作用

• 批准号: 0713837
• 负责人: Mary-Louise Timmermans
• 金额: $ 20.93万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-09-15 至 2009-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0713837&HistoricalAwards=false
• 关键词: Role; Anticyclonic; Eddies; Arctic; Halocline

Timmermans 0713837WHOIThe halocline of the Arctic Ocean tends to isolate the sea ice on the surface of the ocean from the heat carried into the ocean with flows of warm Atlantic Water. Changes in the structure or persistence of this halocline will, thus, have an important influence on the rate of change of sea ice cover in the Arctic and, consequently, global climate. How this halocline is maintained is an open question, but one theory strongly implicates the lateral flux of cold waters, in the form of eddies, from the shelves surrounding the Arctic Ocean.Funds are provided to investigate the origin, dynamics, and role in the halocline of the large number of shallow eddies recently observed in the Arctic Ocean's Canada Basin. The principal investigators intend to accomplish this by analysis of recent measurements, dynamical process studies, and analysis of historical data in the context of the new measurements. Data from the newly developed Ice-Tethered Profiler (ITP) makes possible a comprehensive analysis of the eddies. An array of ITPs currently is returning sustained observations of upper-ocean temperature and salinity from a substantial region of the Canada Basin over all seasons. The preliminary analysis of these data has shown eddies to be a prevalent feature of the Canada Basin halocline that can be well-resolved by the high-resolution ITP sampling.

Timmermans 0713837WHOI北冰洋的盐跃层倾向于将海洋表面的海冰与温暖的大西洋水流带入海洋的热量隔离开来。 因此，这种盐跃层的结构或持续性的变化将对北极海冰覆盖的变化率产生重要影响，从而对全球气候产生重要影响。 如何维持这种盐跃层是一个悬而未决的问题，但有一种理论强烈暗示的横向通量的冷沃茨，在涡旋的形式，从周围的货架北冰洋。资金提供调查的起源，动力学和盐跃层的作用，最近观察到的大量的浅涡旋在北冰洋的加拿大盆地。主要研究人员打算通过分析最近的测量结果、动力学过程研究以及在新测量的背景下分析历史数据来实现这一目标。来自新开发的冰系剖面仪（ITP）的数据使得对涡旋进行全面分析成为可能。目前，一系列国际热带气旋方案正在返回加拿大海盆大部分地区所有季节的上层海洋温度和盐度的持续观测结果。这些数据的初步分析表明，漩涡是加拿大盆地盐跃层的一个普遍特征，可以很好地解决了高分辨率ITP采样。